<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        .tab ul {
            overflow: hidden;
            padding: 0;
            margin: 0;
        }
        
        .tab ul li {
            box-sizing: border-box;
            padding: 0;
            float: left;
            width: 100px;
            height: 45px;
            line-height: 45px;
            list-style: none;
            text-align: center;
            border-top: 1px solid blue;
            border-right: 1px solid blue;
            cursor: default;
        }
        
        .tab ul li:first-child {
            border-left: 1px solid blue;
        }
        
        .tab ul li.active {
            background-color: orange;
        }
        
        .tab div {
            width: 500px;
            height: 300px;
            display: none;
            text-align: center;
            font-size: 30px;
            line-height: 300px;
            border: 1px solid blue;
            border-top: 0px;
        }
        
        .tab div.current {
            display: block;
        }
        
        [v-cloak] {
            display: none;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="tab">
            <ul>
                <!-- <li class="active">apple</li>
                <li>orange</li>
                <li>lemon</li> -->
                <li v-for='(item,index) in list' :k='item.id' v-cloak :class='{active:current==index}' @click='click(index)'>{{item.title}}</li>
            </ul>
            <!-- <div class="current">
                <img src='img/apple.png'>
            </div>
            </ul>
            <div>
                <img src='img/orange.png'>
            </div>
            </ul>
            <div>
                <img src='img/lemon.png'>
            </div> -->
            <div v-for='(item,index) in list' :key='item.id' :class='{current:current==index}'>
                <img :src='item.path'>
            </div>
        </div>
    </div>
    <script type="text/javascript" src="../js/vue.js"></script>
    <script type="text/javascript">
        const vue = new Vue({
            el: '#app',
            data: {
                current: 0,
                list: [{
                    id: 1,
                    title: 'apple',
                    path: 'img/apple.png'
                }, {
                    id: 2,
                    title: 'orange',
                    path: 'img/orange.png'
                }, {
                    id: 3,
                    title: 'lemon',
                    path: 'img/lemon.png'
                }]
            },
            methods: {
                click: function(index) {
                    this.current = index;
                }
            }
        });
    </script>
</body>

</html>